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相关概念视频

Hydrolysis01:15

Hydrolysis

117.2K
Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
117.2K
Lysosomal Hydrolases01:22

Lysosomal Hydrolases

3.9K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.9K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

3.2K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
3.2K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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相关实验视频

Updated: Sep 25, 2025

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
12:07

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Published on: April 16, 2018

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用机器学习辅助的PET脱聚合的水溶酶工程

Hongyuan Lu1, Daniel J Diaz2, Natalie J Czarnecki1

  • 1McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, TX, USA.

Nature
|April 28, 2022
PubMed
概括
此摘要是机器生成的。

一种新型的酶FAST-PETase有效地降解塑料废物,使得聚乙烯甲酸盐 (PET) 的可扩展的酶循环. 这一突破为塑料污染提供了绿色解决方案,

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles

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科学领域:

  • 生物技术
  • 聚合物科学
  • 环境科学

背景情况:

  • 塑料废弃物,特别是聚乙烯二甲酸 (PET) 是一个重大的生态挑战.
  • 酶降解为PET废物回收提供了一个有希望的,绿色和可扩展的方法.
  • 现有的PET水溶剂在强度,反应速度和直接使用未经处理的塑料方面面临限制.

研究的目的:

  • 通过基于结构的机器学习来设计强大的高活性PET酶.
  • 开发一种功能,活性,稳定和耐受的PETase (FAST-PETase) 以有效降解PET.
  • 证明FAST-PETase在工业规模的酶性塑料回收中的可行性.

主要方法:

  • 采用基于结构的机器学习算法来设计一种新的PET酶.
  • 引入了五种特定突变 (N233K/R224Q/S121E和D186H/R280A) 来产生FAST-PETase.
  • 在不同温度 (30~50°C) 和pH值下评估FAST- PETase活性,并对各种消费后PET产品和水瓶进行了有效性测试.

主要成果:

  • 与野生类型和其他工程酶相比,工程FAST-PETase具有更高的PET-水解活性.
  • 在一周内,FAST- PETase有效地从51种不同的产品中降解未经处理的PET.
  • 通过脱聚合PET和重合成单体制成新的PET,证明了闭环PET回收工艺.

结论:

  • FAST-PETase代表了PET酶降解的显著进步,克服了以前的水解酶的局限性.
  • 该工程酶具有高效率和强度,适合直接应用于未经处理的塑料废物.
  • 这项研究验证了PET的可行工业化酶循环路径,为循环碳经济做出了贡献.